1893.] NATURAL SCIENCES OF PHILADELPHIA. 59 



form was found in any other part of British Columbia. If it be 

 found that aonalasehkce and pallasii breed indifferently across com- 

 mon ground in the interior and Rocky Mountain regions of British 

 Columbia, without the intervention of intermediates, a more com- 

 plete separation of the two than is now recognized must be made. 

 At least two points are established by skins in the collection — lst ? 

 the breeding of aonalaschkae in the Rocky Mountains of British 

 Columbia ; 2nd, the breeding of pallasii west of the Rockies and 

 south of the 52nd parallel. 



257. Merula migratoria propinqua. Western Robin. 

 Uniformly abundant everywhere. 



258. Hesperocichla naevia. Varied Thrush. 



Abundant on the coast, but by no means confined thereto, being 

 found at high altitudes on all the mountains of the interior to the 

 Rocky Mountain summits. 



259. Sialia mexicana. Western Bluebird. 



Not common anywhere but less so in the east Cascade districts 

 where it does not range beyond the Transition Zone. 



260. Sialia arctica. Arctic Bluebird. 



Abundant in northern and western interior portions of British 

 Columbia. 



A tabulated list of all the specimens forming the author's collec- 

 tion of British Columbia and Washington birds, including those 

 collected by Messrs Morris and Evans in the same region, is appen- 

 ded. The collection has been recently purchased by the Academy 

 of Natural Sciences. 



